[Bug 762809] alpha: Sample pipeline does not demonstrate functionality

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=762809

Nicolas Dufresne (stormer) <nicolas.dufresne at collabora.co.uk> changed:

           What    |Removed                     |Added
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 Attachment #322579|none                        |reviewed
             status|                            |

--- Comment #5 from Nicolas Dufresne (stormer) <nicolas.dufresne at collabora.co.uk> ---
Review of attachment 322579:
 --> (https://bugzilla.gnome.org/review?bug=762809&attachment=322579)

Just a detail, otherwise looks better.

::: gst/alpha/gstalpha.c
@@ +32,3 @@
  * |[
  * gst-launch-1.0 videotestsrc pattern=smpte75 ! alpha method=green ! \
+ *   videomixer name=mixer sink_0::zorder=1 sink_1::zorder=0 ! \

While doing so, we could change to use compositor (same API). In order to
guaranty working pipeline, we should link with mixer.sink_0 and mixer.sink_1
too.

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